Biosignal detector



FIG. 1 is a front perspective view of a biosignal detector showing our new design;

FIG. 2 is another front perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a biosignal detector, as shown and described. 